Syringe



G. B. DICKINSON.

SYRINGE.

(ModeL) Patented July 14,1891.

ATTORNEYS:

04, mmo-Lrma, WASNINGICIN n c UNITED STAT-Es AT-ENT OFFICE.

CHARLES B. DICKINSON, OF BROOKLYN, NE\V YORK.

SYRINGE.

SPECIFICATION forming part of Letters Patent No. 455,939, dated July 14,1891.

I Application filed May 18, 1889. Serial No. 311x296. (ModeL) To allwhom it may concern.-

Be it known that 1, CHARLES E. DICKINSON,

a citizen of the United States, and a resident prise the advantages ofthe common straight tube used on intermittent-flow syringes andatomizers, and also the advantages of conduits, also in common use,which employ a flattened or self-collapsible section which constitutethe so-called continuous-flow syringes.

To this end my invention consists of a conduit of soft india-rubber,consist-in g of a continuous tube from end to end and of the conduitexpanded laterally at a point between its ends to form opposingdiaphragms united at their outer edges, but opening in a slot into thetube, the adjacent inner surfaces of which are normally parallel and inclose contact with each other, while the tube remains open throughout.

Referring to the accompanying drawings, in which similar lettersindicate corresponding parts in all the figures, Figure 1 is a sideelevation of the preferred form of my new conduit, shown connected to arubber-pump bulb of ordinary construction. Fig. 2 is a similar viewshowing the end of the conduit provided with an ordinary syringe-tip.Fig. 3 is a sectional elevation taken in the line as at of Fig. 1,showing in full lines the walls of the self -collapsible section closednearly in contact with each other, the normal condition being in closecontact; and Fig. 4 is a view of the end of the conduit finished to forma contracted tip.

My new conduit is made of soft india-rubber and formed or provided witha self-collapsible section or chamberA of any suitable length and width.This self-collapsible section is formed with two connections or necks aand b, the former a of which is connected bya tube B to the valvededuction end of the pump-bulb C. The latter I) is provided with a tube Dof varying length to suit any purpose for which the conduit may bedesigned. This tube Dmay be finished to form a up f,

or it may beleft open to receive any form. of

separate nozzle or tip, as the syringe-tip E. Along the center or sidesof the self-collapsible section A are formed the ribs or strips 6, whichare outwardly curved, or the section may be otherwise constructed toform the passage d for furnishing a freeflow for the fluid from the pumpthrough the self-collapsible section to the end or tip of the conduit.At the sides of the passage cl are formed extended opposite diaphragmsee, which are expanded by internal pressure when the pump 0 iscompressed, as shown in dotted lines in Fig. l, and which contractuponrelaxation of the pump, thus serving to store up a part of the powerexerted at the pump to maintain a continuous flow during the intervalsof compression. The collapsible portion is preferably curved so that theinner surfaces of the diaphragms e e normallystand in close or nearlyclose contact, thus serving to automatically expel the entire contentsof the section after operation of the pump ceases, except what remainsin the passage d. The side strips 0 act like independent springs toclose the self-collapsible section and prevent it from stretchingbeyondbound s, andthey stiffenthesection,

so that it will not bend or buckle and stop the flow, and the passage 01facilitates the ready action of the device and the cleaning (if used fora syringe) after use, and by using the common rubber tubes B D theconduit as a whole may be bent into any desired position, as indicatedin Fig. 2, without in any manner cutting off or interrupting the flow,as in conduits formed of flattened or corrugated tubes now used incontinuous-flow syringes.

When used for a syringe, the pump 0 will be provided with an inlet-tubeF, as shown; but when used for forcing air this tube will be omitted. 4

The pump 0 is provided with the usual or any appropriate form of inletand outlet valves 9 h. (Shown in dotted lines in Fig. 1.)

By constructing the conduit as herein described thereis at all times afree passage through the conduit. In other words, the free open tube isalways intact,furnishing a free passage, as with a common intermittent-2 esaese flow syringe, which is advantageous for light injections andalso in cleaning the syringe, and where more than a single bulbful is tobe injected the syringe also possesses the advantage of continuous flow.Furthermore, as a matter of construction, by this form I am enabled tomake the chamber integral with the tubular portions.

I am aware that it is not new to make conduits of flattened andcorrugated tubes, or to provide conduits with selfcollapsible separablebulbs folded in at four points to form a star-shaped bellows-likecollapsible chamber, as in the patent to T. F. Matthews, August 2, 1887,No. 367,648, and therefore lay no claim to such structures. v

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

CHARLES E. DICKINSON.

Witnesses H. A. WEST, WILLIAM B. SMITH.

